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Marketable Securities Marketable Securities, Gains and Losses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Gain (Loss) on Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 25,490
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	90
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(54)
Available-for-sale Securities, Debt Securities	25,526
Corporate Debt Securities [Member]
Gain (Loss) on Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	18,832
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	68
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(43)
Available-for-sale Securities, Debt Securities	18,857
Municipal Bonds [Member]
Gain (Loss) on Investments [Line Items]
Available-for-sale Securities, Amortized Cost Basis	6,658
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	22
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(11)
Available-for-sale Securities, Debt Securities	$ 6,669

X

- Definition

Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax

+ References

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Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 320

-Section 50

-Paragraph 2

-Subparagraph (b)-(g)

-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

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